A SYNOPSIS OF THE Principles of Combination, AS INVESTIGATED IN THE PRECEDING PAGES, ARRANGED IN A TABULAR FORM SO AS TO AFFORD THE STUDENT AN EASY REFERENCE TO THE KEY LETTERS. _A Synopsis of the Principles of Medicinal Combination._ OBJECT I. TO PROMOTE THE ACTION OF THE BASIS. Key Letters. =A= A.—_By combining the several different forms, or preparations of the_ SAME SUBSTANCE. =B= B.—_By combining the Basis with Substances which are of the_ SAME NATURE, _i. e, which are individually capable of producing the same effects, but with less energy than when in combination with each other_. =C= C.—_By combining the Basis with Substances of a_ DIFFERENT NATURE, _and which do not exert any Chemical influence upon it, but are found by experience, or inferred by analogy, to be capable of rendering the stomach, or system, more susceptible of its action_. OBJECT II. TO CORRECT THE OPERATION OF THE BASIS, BY OBVIATING ANY UNPLEASANT EFFECTS IT MIGHT BE LIKELY TO OCCASION, AND WHICH WOULD PERVERT ITS INTENDED ACTION, AND DEFEAT THE OBJECT OF ITS EXHIBITION. =D= A.—_By_ CHEMICALLY _neutralizing, or_ MECHANICALLY _separating, the offending ingredient_. =E= B.—_By adding some substance calculated to guard the stomach, or system against its deleterious effects._ OBJECT III. TO OBTAIN THE JOINT OPERATION OF TWO, OR MORE MEDICINES. =F= A.—_By uniting those Medicines which are calculated to produce the_ SAME ULTIMATE RESULTS, _but by modes of operation totally different_. =G= B.—_By combining Medicines which have entirely different powers, and which are required to obviate different symptoms, or to answer different indications._ OBJECT IV. TO OBTAIN A NEW AND ACTIVE REMEDY, NOT AFFORDED BY ANY SINGLE SUBSTANCE. =H= A.—_By combining Medicines which excite different actions in the stomach and system, in consequence of which_ NEW, _or_ MODIFIED RESULTS _are produced_. B.—_By combining substances which have the property of acting_ CHEMICALLY _upon each other; the results of which are_— =I= a. _The Formation of New Compounds._ =K= b. _The Decomposition of the Original Ingredients, and the developement of their more active elements._